CVE-2026-83520

HighCVSS 8.8/10Last modified Oct 22, 2026

Description

Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-502

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
Microsoft	.NET 10.0 runtime	>= 10.0.0, < 10.0.13
Microsoft	.NET 11.0 runtime	>= 11.0.0, < 11.0.0-rc.2
Microsoft	.NET 8.0 runtime	>= 8.0.0, < 8.0.32
Microsoft	.NET 9.0 runtime	>= 9.0.0, < 9.0.21
Microsoft	Microsoft .NET Framework 3.5	>= 3.5.0, < 2.0.50727.9188 AND 3.0.30729.9171
Microsoft	Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2	>= 3.0.0.0, < 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0
Microsoft	Microsoft .NET Framework 3.5 AND 4.7.2	>= 4.7.0, < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0
Microsoft	Microsoft .NET Framework 3.5 AND 4.8	>= 4.8.0, < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0
Microsoft	Microsoft .NET Framework 3.5 AND 4.8.1	>= 4.8.1, < 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
Microsoft	Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2	>= 4.7.0, < 4.7.4150.0
Microsoft	Microsoft .NET Framework 4.8	>= 4.8.0, < 4.8.4811.0
Microsoft	Microsoft .NET Framework 4.8.1	>= 4.8.0.0, < 4.8.9363.0
Microsoft	Microsoft Visual Studio 2022 version 17.14	>= 17.14.0, < 17.14.42
Microsoft	Microsoft Visual Studio 2026 version 18.10	>= 18.10.0, < 18.10.4

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83520

Timeline

Published: Oct 13, 2026
Last modified: Oct 22, 2026
NVD status: Awaiting Analysis

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